Home / 21,379.40-31,996.20-19,629.80

Finding the Fourth Proportional to 21,379.40, 31,996.20 and 19,629.80

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Solution

The fourth proportional to 21,379.40, 31,996.20 and 19,629.80 is: 29,377.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,379.40 : 31,996.20 = 19,629.80 : x
  2. Step 2: Convert to fraction form
    21,379.40/31,996.20 = 19,629.80/x
  3. Step 3: Cross multiply
    21,379.40x = 31,996.20 × 19,629.80
  4. Step 4: Simplify right side
    21,379.40x = 628,079,006.76
  5. Step 5: Solve for x
    x = 628,079,006.76/21,379.40
  6. Step 6: Final answer
    x = 29,377.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.